Search results for: Free PDF Quiz 2024 High Hit-Rate EMC D-PM-IN-23 Latest Test Report 🍂 Search for ✔ D-PM-IN-23 ️✔️ and download exam materials for free through [ www.pdfvce.com ] 🦞Questions D-PM-IN-23 Exam
-
Rate effects in centrifuge piezocone penetration on dilatant silica silt and subsequent dissipation
Centrifuge testing on industrial silt-sized silica particles was performed to investigate the possibility of using variablerate piezocone tests to gain additional data in soils. In order to perform partially to fully drained piezocone tests in the saturated silica samples, a careful combination of penetration rates, probe diameter and coefficient of consolidation of the centrifuge samples was assigned. The piezocone tests were then performed at 50g with a 12-mm diameter piezocone at different penetration rates. Measurements of excess pore pressure ∆u in the samples allowed the assessment of the radial distribution of pore pressure during penetration, where the tendency for the silica flour to dilate was observed. In general, negative values of ∆u were measured near the piezocone, whilst positive ∆u values were measured in the far field. The data were then used to describe the behaviour of dilatant soils with increasing penetration rate of the probe, and its shortcomings in the soil penetration.
-
Digital optimisation workflow in early project phases and what it can bring when looking at the MacLeamy curve
It is known from the MacLeamy curve that early effort in project developments pays off. Any change in early project phases takes less effort and is more effective in impacting cost and success of the project than a change that incurs later. This contribution points out possible savings by employing numerical optimisation for achieving the optimal design with respect to both code-conforming performance and construction costs for common geotechnical systems such as ground improvements. One of the bottlenecks for the widespread use of numerical optimisation for design is perhaps the lack of a workflow management program. In the present paper, a structure of a functional workflow management program based on Python, its standard library, third-party packages, and external APIs will be detailed. In addition to that, some fundamentals of how optimisation works will be presented. One meaningful use case of the automated optimisation applied to the design of ground improvements for LNG tank foundation is presented. Extensions to digital ground model provided by the BIM process and seamless information transfer to the construction site purposed for the implementation of the observational method in geotechnical design will be drawn.
-
Scrap-tyre Soil Mixture For Seismic Protection
Scrap tyre stockpile has been a significant disposal problem around the world. Significant research attention has been devoted in recent years to find new beneficial ways to recycle and reuse the huge stockpile. This paper proposes a new method of utilizing scrap tyres for infrastructure protection. The method involves mixing scrap tyres with soil materials and placing the mixtures around foundations for vibration absorption. This method provides two major benefits: (i) the low-cost would make it accessible to developing countries and rural areas of developed countries where resources and technology are not adequate for earthquake mitigation with welldeveloped, expensive, techniques and (ii) potential to consume the huge stockpiles of scrap tyres all over the world. However, the success of the proposed method depends on the static and dynamic properties of scrap tyresoil mixtures. This paper presents results of recent experimental investigations on tyre (tyre crumbs)-soil mixtures carried out at University of Wollongong.
-
Climatic factors for AS2870 for the metropolitan Sydney area
AS2870-1996 “Residential Slabs and Footings – Construction” correlates depths of design suction change (Hs) to regional climatic zones as delineated by the Thornthwaite Moisture Index (TMI). TMI is a measure of aridity, quantifying the cyclical wetting and drying of soils. TMI is a function of rainfall, potential evapotranspiration and soil water-holding capacity, and provides an indication of moisture balance.
Further to work done by Chan and Mostyn (2004), this paper includes the complete TMI dataset for the metropolitan Sydney area. This paper provides improved estimates of Hs that can be considered in the calculation of characteristic surface movement (ys) in metropolitan Sydney when classifying residential sites under AS2870-1996.
-
2018 Sydney Symposium
Advances in Site Investigations, Monitoring and Instrumentation
Peter K. Robertson and Michael Nicholson
-
Application of advanced in situ testing equipment and methodologies to characterise a low strength soil deposit in Sydney Harbour
In situ testing equipment and methodologies have evolved rapidly over the last 5 years. This paper looks at three devices that demonstrate this evolution: (1) a Special Purpose 3MPa CPTu Cone; (2) the automated Medusa flat plate dilatometer; and (3) the automated down-the-hole Vane Shear device. CPTu cones are now commercially available with special internal design and with capacities as low as 3MPa. These “special” cones, when carefully calibrated, are capable of reliably measuring CPTu parameters in soils right to the bottom end of the very soft range. The cones come with a temperature sensor to enable the management of potential inaccuracies associated with transient temperature effects during the penetration. The Medusa DMT, was developed by Marchetti to provide technicians and engineers with complete control and repeatability of the DMT diaphragm inflation and measurement process, eliminating many of the operator-dependant variables often encountered with the traditional gas-operated DMT. The Vane Shear Test is perhaps the most relied-upon geotechnical strength test; however traditionally it has had in-built potential errors, particularly in very soft soils, mainly due to ambiguity in friction corrections; it has been traditionally restricted to use in pure clay or clay-like soils. Equipment design has evolved (in some equipment) to eliminate the friction-correction problem. High quality calibration is required. These advanced in situ testing tools and improved methodologies were utilised in combination to characterise a low strength soil deposit in Sydney Harbour for a major infrastructure project. The results from the use of the advanced equipment and methods are discussed and reviewed in this paper.
-
Considerations In Applying Geotextiles To Coastal Revetments
The application of geotextile membranes in breakwater and revetment design raises the issue of the appropriate soil/geotextile and geotextile/geotextile friction angles that can be adopted for stability analysis. A considerable amount of data, much derived from the design of landfills, has been published on this subject. Other data are provided by geotextile manufacturers. Much of the data refer to a variety of woven fabrics, but data exist also for non-woven needle punched geotextiles that are used in coastal engineering structures. This paper reviews the local practice and literature and proposes appropriate values for soil/geotextile and geotextile/geotextile friction angles that may be considered for the preliminary design of coastal revetment structures.
-
Concrete injection column ground treatment design within a brownfield site with compressible soils
Concrete Injection Columns (CICs) are commonly used in geotechnical ground treatment to meet serviceability and stability design criteria. Together with a load transfer platform, the design objectives are achieved by bridging future fills across existing fills and soft materials to transfer loads from a higher level to a stronger underlying material layer. Efficient CIC design within brownfield sites can be challenging when there is high variability or uncertainty in the depths and extents of existing fills and soft materials. This case study presents the CIC ground treatment design development and validation required to support the future rail earthworks platform for the Sydney Metro West – Western Tunnelling Package Clyde Stabling & Maintenance Facility (SMF). The selected performance based geotechnical ground treatment design comprised 0.45m diameter CICs at typical 2m centre to centre (c/c) spacings to overcome the risk of excessive site wide settlements and meet the project settlement criteria. Validation included a CIC installation trial to calibrate CIC rig torque readings intersecting soft materials and a static load test to demonstrate CIC settlement performance in line with predicted settlement behaviour, reducing uncertainty in the installation methodology and production CIC performance prior to construction.
-
A preliminary study of strength behaviour of lime-slag treated pyrite bearing soft Coode Island Silt
The prime locations of the central business district of Melbourne are underlain by extensive deposits of a very soft and highly compressible soil, locally known as Coode Island Silt (CIS). This soft deposit poses serious challenges for the design and construction of economic foundations. The conventional practice for almost any construction over this soft soil is to use pile foundations extended to Melbourne mudstone layer situated at about 30 m depth. Results from recent researches on employing soil mixing technique to improve the engineering properties of this soft soil by using different additives have been found to be promising. Pyrite bearing CIS was treated with lime-activated slag of various proportions. Presence of pyrite is responsible for creation of acidic environment through its oxidation and thereby hindering the progress of cementitious reactions. Through experimental study it has been found that providing higher amount of lime can be an effective way of overcoming the adverse effect of pyrite. Initial Consumption of Lime (ICL) test can be a useful tool to determine the minimum amount of lime required for the stabilization to be effective. The results of experimental investigations, consisting of unconfined compressive strength tests and XRD analyses, on soft CIS treated with lime-activated slag are presented in this paper. In addition, the importance of carrying out ICL test for the selection of additive dosage is highlighted by presenting the results of strength tests of CIS treated with lime contents both above and below ICL.